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WO2013032129A1 - Émetteur d'énergie sans fil et procédé de transmission d'énergie sans fil - Google Patents

Émetteur d'énergie sans fil et procédé de transmission d'énergie sans fil Download PDF

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Publication number
WO2013032129A1
WO2013032129A1 PCT/KR2012/005448 KR2012005448W WO2013032129A1 WO 2013032129 A1 WO2013032129 A1 WO 2013032129A1 KR 2012005448 W KR2012005448 W KR 2012005448W WO 2013032129 A1 WO2013032129 A1 WO 2013032129A1
Authority
WO
WIPO (PCT)
Prior art keywords
power
wireless power
receiver
wireless
transmitter
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/KR2012/005448
Other languages
English (en)
Inventor
Woo Kil Jung
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
LG Innotek Co Ltd
Original Assignee
LG Innotek Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by LG Innotek Co Ltd filed Critical LG Innotek Co Ltd
Priority to US14/241,146 priority Critical patent/US9184634B2/en
Priority to CN201280053177.7A priority patent/CN103959597A/zh
Priority to EP12828274.6A priority patent/EP2748911B1/fr
Publication of WO2013032129A1 publication Critical patent/WO2013032129A1/fr
Anticipated expiration legal-status Critical
Priority to US14/325,120 priority patent/US9184635B2/en
Priority to US14/876,098 priority patent/US9722463B2/en
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
    • H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J5/00—Circuit arrangements for transfer of electric power between AC networks and DC networks
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/80—Circuit arrangements or systems for wireless supply or distribution of electric power involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
    • H04B5/70—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes
    • H04B5/79—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes for data transfer in combination with power transfer

Definitions

  • the disclosure relates to a wireless power transmitter and a wireless power transmission method thereof.
  • the disclosure relates to a wireless power transmitter capable of effectively transmitting power by actively controlling the power according to the recognition of a wireless power receiver, and a wireless power transmission method thereof.
  • a wireless power transmission or a wireless energy transfer refers to a technology of wirelessly transferring electric energy to desired devices.
  • an electric motor or a transformer employing the principle of electromagnetic induction has been extensively used and then a method for transmitting electrical energy by irradiating electromagnetic waves, such as radio waves or lasers, has been suggested.
  • electromagnetic waves such as radio waves or lasers
  • electrical toothbrushes or electrical razors which are frequently used in daily life, are charged based on the principle of electromagnetic induction.
  • the long-distance transmission using the magnetic induction, the resonance and the short-wavelength radio frequency has been used as the wireless energy transfer scheme.
  • the wireless power transmission system includes a transmitter and a receiver.
  • the transmitter wirelessly transmits power to the receiver, and the receiver receives the power from the transmitter and performs the operation according to the reception of the power.
  • the transmitter since the transmitter cannot recognize the operating state of the receiver, the transmitter continuously transmits power to the receiver so that the receiver can normally operate always.
  • the transmitter always transmits the power to the receiver regardless of the operating state of the receiver as described above, so that high voltage is applied to the coil of the transmitter. Accordingly, when power is transmitted to the receiver thereafter, the erroneous operation or the breakage of the transmitter may occur. In addition, since the transmitter transmits the predetermined quantity of power to the receiver regardless of the quantity of power required by the load of the receiver, remaining power except for the power used in the load of the receiver may be wasted.
  • the existence state of a receiver around a transmitter is determined, and power can be selectively transmitted to the receiver according to the detection result.
  • the quantity of power required by the receiver is recognized, so that only the quantity of power necessary for the receiver can be selectively transmitted.
  • the receiver if the receiver is not located in a place in which power can be transmitted, high voltage can be prevented from being applied to the coil of the transmitter, so that the erroneous operation or the breakage of the transmitter can be prevented.
  • a wireless power transmitter to wirelessly transmit power to a wireless power receiver.
  • the wireless power transmitter includes a power source to generate AC power, a transmission coil receiving power from the power source to generate a magnetic field, a transmission resonance coil coupled with the transmission coil to transmit power to the wireless power receiver using resonance, and a detector detecting an existence state of the wireless power receiver by detecting power transmitted through the transmission resonance coil.
  • a wireless power transmission method by a wireless power transmitter to wirelessly transmit power to a wireless power receiver.
  • the wireless power transmission method includes generating AC power, wirelessly transmitting power supplied from a power source to the wireless power receiver, detecting the transmitted power, and detecting an existence state of the wireless power receiver by detecting the transmitted power.
  • the output of the power is determined according to the existence state of a receiver, and the intensity of the power is adjusted according to the approach state of the receiver, so that the loss of power to be meaningless wasted can be minimized.
  • FIG. 1 is a view showing a wireless power transmission system according to one embodiment of the disclosure
  • FIG. 2 is a circuit diagram showing a transmission coil according to one embodiment of the disclosure
  • FIG. 3 is a circuit diagram showing an equivalent circuit of a power source and a transmitter according to one embodiment of the disclosure
  • FIG. 4 is a circuit diagram showing an equivalent circuit of a reception resonance coil, a reception coil, a rectifier circuit, and a load according to one embodiment of the disclosure
  • FIGS. 5(a) and 5(b) are views showing coils according to the embodiment of the disclosure.
  • FIG. 6 is a block diagram showing a transmitter according to the embodiment of the disclosure.
  • FIG. 7 is a graph showing the transmission state of power according to the embodiment of the disclosure.
  • FIG. 8 is a flowchart showing a method of wirelessly transmitting power according to the embodiment of the disclosure.
  • FIG. 1 is a view showing a wireless power transmission system according to one embodiment of the disclosure
  • the wireless power transmission system may include a power source 10, a transmitter 20, a receiver 30, a rectifier circuit 40, and a load 50.
  • the power generated from the power source 10 is transmitted to the transmitter 20 and then transmitted to the receiver 30 that makes resonance with the transmitter 20, that is, has a resonant frequency value equal to that of the transmitter 20 using resonance.
  • the power transmitted to the receiver 30 is transmitted to the load 50 through the rectifier circuit 40.
  • the load 50 may be a battery or other devices requiring the power.
  • the power source 10 is an AC power source to provide AC power having a predetermined frequency.
  • the transmitter 20 includes a transmission coil 21 and a transmission resonance coil 22.
  • the transmission coil 21 is connected to the power source 10 and AC current flows through the transmission coil 21. As the AC current flows through the transmission coil 21, the AC current is induced to the transmission resonance coil 22, which is physically spaced apart from the transmission coil 21, through the electromagnetic induction.
  • the power transmitted to the transmission resonance coil 22 is transmitted to the receiver 30 which forms a resonant circuit together with the transmitter 20 by resonance.
  • the power can be transmitted between two LC circuits which are impedance-matched.
  • the power transmission scheme using the resonance can transmit the power farther than the power transmission scheme using the electromagnetic induction with the higher power transmission efficiency.
  • the receiver 30 includes a reception resonance coil 31 and a reception coil 32.
  • the power transmitted through the transmission resonance coil 22 is received in the reception resonance coil 31 so that the AC current flows through the reception resonance coil 31.
  • the power transmitted to the reception resonance coil 31 is transmitted to the reception coil 32 through the electromagnetic induction.
  • the power transmitted to the reception coil 32 is rectified through the rectifier circuit 40 and then transmitted to the load 50.
  • the receiver may include the rectifier circuit 40, which is provided at the rear end of the reception coil 32 and includes a rectifier diode and a smoothing capacitor to smooth a rectified signal, if the supply of the DC power is required, or may have the structure without the rectifier circuit 40 including the diode and the smoothing capacitor in the case of parts requiring the supply of power having an AC waveform.
  • the transmission resonance coil 22 and the reception resonance coil 21 are elements to increase the transmission efficiency of the wireless power. Accordingly, only one of the transmission resonance coil 22 and the reception resonance coil 21 may be used or none of the transmission resonance coil 22 and the reception resonance coil 21 may be used.
  • the transmission resonance coil 22 of the transmitter can transmit power to the reception resonance coil 31 of the receiver 30 through a magnetic field.
  • the transmission resonance coil 22 and the reception resonance coil 31 are resonance-coupled with each other so that the transmission resonance coil 22 and the reception resonance coil 31 operate at the resonance frequency.
  • the power transmission efficiency between the transmitter 20 and the receiver 30 can be greatly improved due to the resonance-coupling between the transmission resonance coil 22 and the reception resonance coil 31.
  • FIG. 2 is a circuit diagram showing the transmission coil 21 according to one embodiment of the disclosure.
  • the transmission coil 21 may include an inductor L1 and a capacitor C1 and a circuit having predetermined inductance and capacitance values can be formed by using the inductor L1 and the capacitor C1.
  • the capacitor C1 may include a variable capacitor, and impedance matching may be performed by adjusting the variable capacitor.
  • the variable capacitor may be series-connected.
  • the variable capacitor may be parallel-connected.
  • the equivalent circuit of the transmission resonance coil 22, the receiving resonant coil 31 and the receiving coil 22 may the same as the equivalent circuit shown in FIG. 2.
  • FIG. 3 is a view showing an equivalent circuit of the power source 10 and the transmitter 20 according to one embodiment of the disclosure.
  • the transmission coil 21 and the transmission resonance coil 22 may be constructed by using inductors L1 and L2 having predetermined inductance values and capacitors C1 and C2 having predetermined capacitance values.
  • FIG. 4 is a view showing an equivalent circuit of the reception resonance coil 31, the reception coil 32, the rectifier circuit 40, and the load 50 according to one embodiment of the disclosure.
  • the reception resonance coil 31 and the reception coil 31 may be constructed by using inductors L3 and L3 having preset inductance values and capacitors C3 and C4 having preset capacitance values.
  • the rectifier circuit 40 may include a diode D1 and a smoothing capacitor C5 to convert AC power into DC power to be output.
  • the load 50 may include a predetermined rechargeable battery or a device requiring DC power.
  • a solenoid-type self inductance L and a parasitic capacitance C shown in FIGS. 5(a) and 5(b) can be expressed following Equations 1 and 2.
  • FIG. 6 is a view showing a transmitter according to the embodiment of the disclosure
  • FIG. 7 is a view showing a power transmission state according to the embodiment of the disclosure.
  • FIG. 6 shows the structure having the power source 10 and the transmitter 20 of FIG. 1.
  • the transmission coil 21, and the transmission resonance coil 22 may be included in the transmitter 20, or may be included in the power source 10.
  • the transmitter 20 may include the power source 10 to supply transmission power, the transmission coil 21 connected to the power source 10 and generating a magnetic field by the supplied power, the transmission resonance coil 22 coupled with the transmission coil 21 to transmit power, a detector 23 to detect the existence state of the receiver 30, and the controller 29 to control the state of the power supplied through the power source 10 according to the detection result of the detector 23.
  • the detector 23 may detect the state of the power transmitted through the transmission resonance coil 22 and may transmit the detection result of the state of the power to the controller 29.
  • the detector 23 includes a first power detector 24 to detect the intensity of power output through the power source 10 to convert the power into DC power, a detection coil 25 to detect the intensity of a magnetic field generated from the transmission resonance coil 22, a second power detector 26 to convert the power generated by the magnetic field detected by the detection coil 25 into DC power, and a comparator 28 to compare the output of the first power detector 24 with the output of the second power detector 26 and transmit the comparative result to the controller 29.
  • the detector 23 may further include an amplifier 27 to amplify the DC power obtained through the conversion of the second power detector 26.
  • the detector 23 detects the intensity of the magnetic field generated from the transmission resonance coil 23, and the controller 29 makes a determination that the receiver to receive the magnetic field does not exist if the intensity of the magnetic field detected from the detector 23 is greater than or equal to a preset reference value. In addition, if the intensity of the magnetic field is less than the reference value, the controller 29 makes a determination that the receiver exists.
  • the detector 23 may include a current sensor connected to the front end or the rear end of the power source 10 to measure the intensity of current at the front end or the rear end of the power source 10.
  • the current sensor may be placed between the power source 10 and the transmission coil 21.
  • the controller 29 measures the intensity of current output from the power source 10 through a current sensor and makes a determination that the receiver exists if the measured intensity of current is greater than or equal to a threshold current value.
  • the controller 29 makes a determination that the receiver does not exist if the measured intensity of the current is less than the threshold current value.
  • the threshold current value may be the minimum value to detect the receiver.
  • An object of the transmitter according to the disclosure is to automatically prevent power from being transmitted by detecting several cases in which a receiver far away from the transmitter hardly receives power transmitted from the transmitter or the transmitter does not need to generate power because receivers do not exist around the transmitter.
  • a wireless power transmitter in the case in which a wireless power transmitter is installed in an interior and a wireless power receiver is mounted on a cellular phone or a laptop computer, if the cellular phone or the laptop computer does not exist in the interior, or is located far away from the interior, the transmitter can be automatically prevented from outputting power, or high voltage can be prevented from being applied to the coil of the transmitter by reducing the intensity of the output power. Therefore, the erroneous operation of the transmitter or the breakage of the transmitter, which may occur when the cellular phone or the laptop computer is located in a power transmission possible area thereafter so that the transmitter transmits power to the cellular phone or the laptop computer, can be prevented.
  • the principle of the transmitter according to the embodiment of the disclosure is as follows.
  • the transmission resonance coil 22 shown in FIG. 6 stores power by using resonance.
  • the quantity of energy stored in the transmission resonance coil 22 is reduced as the receiver approaches the transmitter, so that the intensity of the magnetic field is weakened. Accordingly, the quantity of power detected in the detection coil 25 is reduced.
  • the detection coil 25 is coupled with the magnetic field generated from the transmission resonance coil 22, and the magnetic field is converted into a DC signal in the second power detector 26. Since the output signal of the second power detector 26 is significantly weak, the output signal may be amplified in the amplifier 27.
  • the output of the first power detector 24 may be used as a reference value.
  • the comparator 28 outputs a comparative result according to the output signal of the second power detector 26 based on the output signal of the first power detector 24 to the controller 29.
  • the energy stored in the transmission resonance coil 22 is increased, so that the intensity of the magnetic field detected by the second power detector 24 is increased.
  • the comparative result output through the comparator 28 may be the difference between the output value of the first power detector 24 and the output value of the second power detector 26.
  • the output value of the comparator 28 is zero or a value approximating zero. If the receiver is gradually away from the transmitter, the output value of the comparator 28 is gradually increased. If the receiver does not exist, the output value of the comparator 28 may be equal to the output value of the first power detector 24.
  • the controller 29 may determine if the receiver exists around the transmitter according to the detection result of the detection part 23.
  • the controller 29 makes a determination that the receiver does not exist, the controller 29 stops the output of the power of the power source 10. In addition, the controller 29 makes a determination that the receiver exits, the controller 29 continuously outputs the power from the power source 10.
  • the controller 29 outputs the power from the power source 10 at a predetermined period of time.
  • controller 29 re-determines the existence state of the receiver based on the power output at a predetermined period, and continuously stops the output of the power or resumes the output of the power according to the determination result.
  • the controller 29 outputs the power at a predetermined period through a time-division scheme in order to minimize the loss of the power.
  • the controller 29 outputs time-divided power at a predetermined time interval for the specific time to determine the existence state of the receiver based on the time-divided power.
  • the controller 29 periodically checks the detection results of the detector 23, and thus adjusts the intensity of the power based on the detection result.
  • the controller 29 increases the intensity of the power output from the power source 10, if the quantity of power supplied from the power source 10 is equal to or make a slight difference from the quantity of the power received in the receiver.
  • the controller 29 decreases the intensity of the power output from the power source 10.
  • the existence state of the receiver 30 is detected based on the intensity of the magnetic field generated from the transmitter 20, so that the transmitter 20 may continuously transmit power or stop the transmission of the power.
  • the magnetic field is generated at a predetermined period through a time-division scheme, thereby minimizing the loss of the power while detecting the existence state of the receiver 30.
  • the intensity of the magnetic field is continuously detected, so that only the quantity of power received in the receiver 30 is supplied from the power source 10.
  • the disclosure is applicable to a power transmission technology based on electromagnetic induction.
  • a wireless power transmitter may not include a transmission resonance coil, and the detector 23 may detect the existence state of the receiver 30 by using the intensity of the magnetic field generated from the transmission coil 21.
  • the controller 29 can enhance the power transmission efficiency by adjusting the output of the power source 10 according to the existence state of the receiver 30.
  • FIG. 8 is a flowchart showing a method of transmitting power according to the embodiment of the disclosure according to steps.
  • power is supplied at a predetermined period through a time-division scheme in the state that the receiver 30 does not exist (A, step S101).
  • the intensity of the magnetic field is detected according to the power supplied through the time-division scheme (step S102).
  • the existence state of the receiver 30 is determined based on the intensity of the magnetic field (step 103)
  • step S101 returns. If the determination is made that the receiver 30 exits, the power having a predetermined intensity a is continuously supplied (B, step 104).
  • the intensity of the magnetic field is continuously detected even in the state that the receiver 30 exists so that the power is continuously supplied (B).
  • the existence state of the receiver 30 is re-determined based on the intensity of the magnetic field.
  • the intensity of the magnetic field is increased in the state that the power having a predetermined intensity a is supplied, power greater than the power required by the receiver 30 is supplied through the power source 10. Accordingly, the intensity of the output of the power source 10 is reduced (C, step S105).
  • the intensity of the magnetic field is continuously monitored, so that the intensity b may be increased or decreased (D).
  • the output of the power is determined according to the existence state of the receiver, and the intensity of the power is adjusted according to the approaching of the receiver, thereby minimizing the loss of power to be meaningless wasted.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Near-Field Transmission Systems (AREA)

Abstract

L'invention concerne un émetteur d'énergie sans fil et un procédé de transmission d'énergie sans fil. L'émetteur d'énergie sans fil, qui transmet de l'énergie sans fil à un récepteur d'énergie sans fil comprend une source d'énergie pour générer un courant électrique en CA, une bobine de transmission recevant de l'énergie provenant d'une source d'énergie pour générer un champ magnétique, une bobine de transmission à résonance couplée à la bobine de transmission pour transmettre l'énergie générée par le champ magnétique à un récepteur d'énergie sans fil par résonance, et un détecteur pour détecter l'état du récepteur d'énergie sans fil par détection de l'énergie transmise via la bobine de transmission à résonance.
PCT/KR2012/005448 2011-08-26 2012-07-10 Émetteur d'énergie sans fil et procédé de transmission d'énergie sans fil Ceased WO2013032129A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US14/241,146 US9184634B2 (en) 2011-08-26 2012-07-10 Wireless power transmitter and wireless power transmission method
CN201280053177.7A CN103959597A (zh) 2011-08-26 2012-07-10 无线电力发射器和无线电力发射方法
EP12828274.6A EP2748911B1 (fr) 2011-08-26 2012-07-10 Émetteur d'énergie sans fil et procédé de transmission d'énergie sans fil
US14/325,120 US9184635B2 (en) 2011-08-26 2014-07-07 Wireless power transmitter and wireless power transmission method
US14/876,098 US9722463B2 (en) 2011-08-26 2015-10-06 Wireless power transmitter and wireless power transmission method

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2011-0085644 2011-08-26
KR1020110085644 2011-08-26

Related Child Applications (3)

Application Number Title Priority Date Filing Date
US14/241,146 A-371-Of-International US9184634B2 (en) 2011-08-26 2012-07-10 Wireless power transmitter and wireless power transmission method
US14/325,120 Continuation US9184635B2 (en) 2011-08-26 2014-07-07 Wireless power transmitter and wireless power transmission method
US14/876,098 Continuation US9722463B2 (en) 2011-08-26 2015-10-06 Wireless power transmitter and wireless power transmission method

Publications (1)

Publication Number Publication Date
WO2013032129A1 true WO2013032129A1 (fr) 2013-03-07

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2012/005448 Ceased WO2013032129A1 (fr) 2011-08-26 2012-07-10 Émetteur d'énergie sans fil et procédé de transmission d'énergie sans fil

Country Status (4)

Country Link
US (3) US9184634B2 (fr)
EP (1) EP2748911B1 (fr)
CN (2) CN103959597A (fr)
WO (1) WO2013032129A1 (fr)

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CN107026516B (zh) * 2016-02-01 2022-04-05 恩智浦美国有限公司 无线充电系统中的接收机移除检测
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JP7224869B2 (ja) * 2018-11-19 2023-02-20 キヤノン株式会社 判定装置、判定方法および送電装置
CN111371189B (zh) 2018-12-26 2024-06-25 恩智浦美国有限公司 在具有复杂谐振电路的无线充电系统中确定q因数
US11394242B2 (en) * 2019-09-12 2022-07-19 Spark Connected LLC Wireless power transfer in-band communication circuit and method
CN112928825A (zh) * 2019-12-06 2021-06-08 恩智浦美国有限公司 确定品质因数的方法及无线充电器

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CN105706333A (zh) * 2013-10-28 2016-06-22 京瓷株式会社 控制装置
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CN103959597A (zh) 2014-07-30
US20140319924A1 (en) 2014-10-30
US9184634B2 (en) 2015-11-10
US20140265622A1 (en) 2014-09-18
EP2748911A1 (fr) 2014-07-02
EP2748911B1 (fr) 2019-09-04
US9184635B2 (en) 2015-11-10
US9722463B2 (en) 2017-08-01
CN108574346A (zh) 2018-09-25
EP2748911A4 (fr) 2015-04-29
CN108574346B (zh) 2021-12-31
US20160028246A1 (en) 2016-01-28

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